ilysaml :
Go into the open world, take a far screenshot of the trees and you'll see the difference between 8x MSAA and 4x MSAA on the jagged edges.
You say that as if I haven't done it in countless games for years. Bear in mind, I said that the difference between 4x and 8x pales in comparison to the difference between 0x and 4x. I figured that it could go without saying, but the visible difference (which is not apparent in the majority of renders anyway) doesn't outweigh the enormous difference in necessary resources. That, and through the years games that are truly cutting edge do not co-exist with hardware that is capable of pushing them at sufficient fps with 8x MSAA (Crysis and so on).
And beyond that, I have to be honest with you. Even in a game like Crysis, the number of draws that have significant enough aliasing to see
any difference between 4x and 8x are few and far between.